| Texto completo | |
| Autor(es): |
Ferraz, Thiago V. de B.
;
Tremiliosi-Filho, Germano
;
Varela, Hamilton
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Solid State Electrochemistry; v. N/A, p. 20-pg., 2025-02-08. |
| Resumo | |
This study investigates the electro-oxidation of ethanol in seawater-like electrolytes with adjusted pH, exploring its potential for CO2 mitigation strategies. Using a polycrystalline platinum bead as a model catalyst in a conventional three-electrode cell, we demonstrate that pH adjustment significantly influences electrochemical performance, with higher oxidation current densities observed at more alkaline pH values. At pH 12, usable current densities for ethanol oxidation were achieved, attributed to the decreased surface coverage of Cl- ions and increased ethoxy ion concentrations, consistent with observations from similar systems in the literature. However, mass transport limitations emerged at higher potential scan rates, evident from the inversion in peak current densities between pH 13 and pH 14 compared to lower scan rates. Additionally, voltammetric profiles indicated a preference for certain platinum crystallographic faces due to variations in chloride and sulfate binding strength. Notably, potential oscillations, not previously reported under such elevated Cl- concentrations, further support these findings. Tafel analysis in the high potential region (> 1.2 V) revealed that the platinum oxide surface does not become more sensitive to ethanol oxidation with increasing pH. These insights provide an initial understanding of the main opportunities and challenges in studying and applying such systems. (AU) | |
| Processo FAPESP: | 20/15230-5 - Centro de Pesquisa e Inovação de Gases de Efeito Estufa - RCG2I |
| Beneficiário: | Julio Romano Meneghini |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |
| Processo FAPESP: | 14/50279-4 - Brasil Research Centre for Gas Innovation |
| Beneficiário: | Julio Romano Meneghini |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |
| Processo FAPESP: | 19/22183-6 - Electrocatálise VI: aspectos fundamentais e aplicados em problemas emergentes e clássicos em conversão eletroquímica de energia |
| Beneficiário: | Edson Antonio Ticianelli |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 21/13002-8 - Estudo da eletro-oxidação de moléculas orgânicas em soluções salinas para simultânea valorização de biomassa e mitigação de CO2 |
| Beneficiário: | Thiago Vasconcelos de Barros Ferraz |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |